Pyxine lilacina is a rare species of saxicolous (rock-dwelling), foliose lichen in the family Caliciaceae.

Found in East Africa, it was scientifically described as a new species in 1975 by lichenologists Dougal Swinscow and Hildur Krog.

[1] The lichen has a brownish-grey to lilac-grey thallus that is tightly appressed to its substrate.

The lobes comprising the thallus are flat, and have pseudocyphellae (tiny pores for air exchange) as well as patches of pruina.

[2] Pyxine lilacina is only known to occur in Uganda and Kenya, where it grows on fully or partially exposed rocks, at elevations ranging between 1,100 to 1,700 m (3,600 to 5,600 ft).